package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

@Slf4j
@RestController
@RequestMapping("/common")
public class CommonController {

    @Value("${regie.path}")
    private String basePath;

    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {
        //file是临时文件，需要转存，否则本次请求完后会删除
        log.info(file.toString());
        //后缀
        String originalFilename = file.getOriginalFilename();
        originalFilename = originalFilename.substring(originalFilename.lastIndexOf("."));
        //UUID 防止文件名重复
        String fileName = UUID.randomUUID().toString()+originalFilename;
        //目录是否存在
        File dir = new File(basePath);
        if(!dir.exists()){
            dir.mkdirs();
        }
        try {
            file.transferTo(new File(basePath + fileName));
//            file.transferTo(new File(basePath + "hello.jpg"));
//            file.transferTo(new File(basePath + file.getOriginalFilename()));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        return R.success(fileName);
    }

    /**
     * 文件下载
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) {
        try {
            //输入流，通过输入流读取文件内容
            FileInputStream fileInputStream=new FileInputStream(new File(basePath+name));
            //输出流，将文件回写到浏览器，在浏览器展示
            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("image/jpeg");

            byte[] buffer = new byte[1024];
            int len=0;
            while((len=fileInputStream.read(buffer))!=-1){
                outputStream.write(buffer,0,len);
                outputStream.flush();
            }
            fileInputStream.close();
            outputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
